package com.mei.demo.filter;

import java.io.IOException;

import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.annotation.WebFilter;

/**
 * 一个过滤器 demo
 * 
 * @author mei.xiaoliang@qq.com
 */
@WebFilter(urlPatterns = "/*")
public class FilterDemo implements Filter {

    @Override
    public void init(FilterConfig arg0) throws ServletException {
        //        System.out.println("初始化......");
    }

    @Override
    public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException {
        //        System.out.println("过滤器操作......");
        //执行操作后必须doFilter  
        chain.doFilter(request, response);
    }

    @Override
    public void destroy() {
        //        System.out.println("销毁......");
    }

}